The subsections below will give the details about which images you should
get for each possible means of installation.

A.2.1. CDROM

There are two different netinst CD images which can be used to install
sarge with the debian-installer. These images are intended to boot from CD
and install additional packages over a network, hence the name 'netinst'.
The difference between the two images is that on the full netinst image
the base packages are included, whereas you have to download these from
the web if you are using the business card image. If you'd rather, you can
get a full size CD image which will not need the network to install. You
only need the first CD of the set.

A.2.3. USB memory stick

It's also possible to install from removable USB storage devices. For
example a USB keychain can make a handy Debian install medium that you
can take with you anywhere.

The easiest way to prepare your USB memory stick is to download
hd-media/boot.img.gz, and use gunzip to extract the 128 MB
image from that file. Write this image directly to your memory stick, which
must be at least 128 mb in size. Of course this will destroy anything already
on the memory stick. Then mount the memory stick, which will now have a FAT
filesystem on it. Next, download a Debian netinst CD image, and copy that file
to the memory stick; any filename is ok as long as it ends in
.iso.

A.2.4. Booting from network

It's also possible to boot debian-installer completely from the net. The
various methods to netboot depend on your architecture and netboot setup.
The files in netboot/ can be used to netboot debian-installer.

A.2.5. Booting from hard disk

It's possible to boot the installer using no removable media, but just an
existing hard disk, which can have a different OS on it. Download
hd-media/initrd.gz, hd-media/vmlinuz,
and a Debian CD image to the top-level directory of the hard disk. Make sure
that the CD image has a filename ending in .iso. Now
it's just a matter of booting linux with the initrd.